"Alexandre Brongniart." The Columbia Encyclopedia, Sixth Edition. 2008. Encyclopedia.com. 22 Dec. 2009 <http://www.encyclopedia.com>.
"Alexandre Brongniart." The Columbia Encyclopedia, Sixth Edition. 2008. Encyclopedia.com. (December 22, 2009). http://www.encyclopedia.com/doc/1E1-BrongnrtA.html
"Alexandre Brongniart." The Columbia Encyclopedia, Sixth Edition. 2008. Retrieved December 22, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-BrongnrtA.html